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Rotational modulation in TESS B stars

Balona, L A, Handler, G, Chowdhury, S, Ozuyar, D, Engelbrecht, C A, Mirouh, G M, Wade, G A, David-Uraz, A and Cantiello, M (2019) Rotational modulation in TESS B stars Monthly Notices of the Royal Astronomical Society.

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Abstract

Light curves and periodograms of 160 B stars observed by the TESS space mission and 29 main-sequence B stars from Kepler and K2 were used to classify the variability type. There are 114 main-sequence B stars in the TESS sample, of which 45 are classified as possible rotational variables. This confirms previous findings that a large fraction (about 40 percent) of A and B stars may exhibit rotational modulation. Gaia DR2 parallaxes were used to estimate luminosities, from which the radii and equatorial rotational velocities can be deduced. It is shown that observed values of the projected rotational velocities are lower than the estimated equatorial velocities for nearly all the stars, as they should be if rotation is the cause of the light variation. We conclude that a large fraction of main-sequence B stars appear to contain surface features which cannot likely be attributed to abundance patches.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Balona, L A
Handler, G
Chowdhury, S
Ozuyar, D
Engelbrecht, C A
Mirouh, G Mg.mirouh@surrey.ac.uk
Wade, G A
David-Uraz, A
Cantiello, M
Date : 27 February 2019
Funders : Science and Technology Facilities Council (STFC)
DOI : 10.1093/mnras/stz586
Copyright Disclaimer : © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model) This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record - L A Balona, G Handler, S Chowdhury, D Ozuyar, C A Engelbrecht, G M Mirouh, G A Wade, A David-Uraz, M Cantiello; Rotational modulation in TESS B stars, Monthly Notices of the Royal Astronomical Society, , stz586, https://doi.org/10.1093/mnras/stz586 - is available online at: https://doi.org/10.1093/mnras/stz586
Uncontrolled Keywords : Stars: early-type. Stars:rotation. Stars: starspots. Stars:oscillations.
Depositing User : Clive Harris
Date Deposited : 11 Mar 2019 15:33
Last Modified : 08 Oct 2019 09:32
URI: http://epubs.surrey.ac.uk/id/eprint/850712

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